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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ec0ef21680987b6b1737ba319387bbc6eccee5ec9572b5a8ebd28d72b06371' 
  AND token = 'xB208A9HjCenNZENEHUWY9G7hw1t/wXVVnTijx2VyUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}